PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS

{
  "id": "334353cae35e7e9a896f9e57d664aa9443000b504c33648bf08506ac1681a028",
  "url": "https://osv.dev/vulnerability/BIT-libphp-2026-17545",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS",
    "summary": "On Windows, PHP's filesystem and stream APIs do not reject reserved device names such as CON, PRN, AUX, NUL, COM1 to COM9, LPT1 to LPT9, CONIN$ and CONOUT$ when they appear as a component of a path. An attacker-controlled filename therefore reaches CreateFileW() and opens a device instead of the regular file the application expected, which can block or hang the request and exhaust worker processes.",
    "evidence": "osv:BIT-libphp-2026-17545",
    "products": [
      {
        "name": {
          "value": "libphp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.2.34",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "8.3.35",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "8.4.26",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "8.5.11",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-libphp-2026-17545",
      "aliases": [
        "BIT-libphp-2026-17545",
        "BIT-php-2026-17545",
        "BIT-php-min-2026-17545",
        "CVE-2026-17545"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.2.0"
                },
                {
                  "fixed": "8.2.34"
                },
                {
                  "introduced": "8.3.0"
                },
                {
                  "fixed": "8.3.35"
                },
                {
                  "introduced": "8.4.0"
                },
                {
                  "fixed": "8.4.26"
                },
                {
                  "introduced": "8.5.0"
                },
                {
                  "fixed": "8.5.11"
                }
              ]
            }
          ],
          "package": {
            "name": "libphp",
            "purl": "pkg:bitnami/libphp",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/libphp/BIT-libphp-2026-17545.json"
          }
        }
      ],
      "modified": "2026-10-26T08:45:05.643313892Z",
      "provider": "osv",
      "references": [
        "https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-17545"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-17545",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 446428,
  "published_at": "2026-10-01T09:29:09.411+00:00"
}